Eraser



April 14, 1931. w. HINES ERASER Filed May 8, 1929 Patented Apr. 14,1931

UNITED STATES WILLIAM HINES, WASHINGTON, DISTRICT COLUMBIA.

. ERASER Application filed May 8, 1929. Serial No. 361,428.

(GRANTED UNDER THE ACT OF MARCH 3, 1883, AS AMENDED APRIL 30,1928; 37D 0. G. 757) This invention described herein may be manufactured and used by or for the Government for Governmental purposes, without the payment to me of any royalty thereon. This invention relates generically to erasers more especially to those of the annular type commonly referred to as typewriter erasers. One object of this invention is to provide an eraser formed entirely ofrubber and hav ing facilities for producing an air blast to remove erased particles or eflect separation of the sheets of carbon or typewritingpaper, thus avoiding smudging of the fingers and loss of time as now occurs in producing multiple carbon copies Where the sheets must be continually separated.

Another object of this invention is to pro vide an eraser of the annular type constructed entirely of rubber and embodying suction devices through the instrumentality of which the eraser may be quickly andfconveniently afiixed to a .face of a typewriter so that when its usage is required it may be readily located.

Another object of this invention is to produce an eraser embodying a rubber body portion circumscribed by an annulus of rubber, the latter having less flexibility than the body portion and constituting a key adapted to seat in a suitable key-way formed in the circular strip of erasing material surrounding the body when occasion demands. y

Another ob] ect of this nventlon is to effect hemispherical shaped portion to form a keyadapted to seat in a key-way formed in the strip of eraser material encircling the peripheral edges of the side sections of the body portion.

Another object of this invention is to pro.-

comprising cup videan all rubber eraser shaped side walls peripherally united and surrounded at the pointof union with an eraser material, the respective sidewalls of flat surfaceaas for instance the.

portion whereby the eraser mate rial to be easily and conveniently replaced.

formed with the the body portion having flexible suction ele ments integral therewith to enable the eraser. to be securel affixed to any flat surface.

Another o ject of this invention is to provide an all rubber typewriter eraserhavingfi a body portion orcup-shaped flexible material peripherally united to provide a blast 0 producing chamber, the latter havingan out-. let nozzle communicating jwith the exterior of the body portion the nozzle being adapted toextend through the annularstrip of era sure material which surrounds the body portion and to function as an anchoring means for said material. 7 p

l/Vith these and other objects in view this invention consists in certain novel details of construction, combination and arrangement of parts tobe more particularly hereinafter set forth and claimed; i

Briefly stated, this invention comprises a body portionformed of a pair of cup-shaped side members unitedat their periphery to provide an air chamber, a nozzle communicating with the air chamber and extending to the exterior of the body portion whereupon compression of the cup-shaped members will produce an air blast, a rubber annulus surrounding the body portion at thepoint of union of the side members, said annulus constituting a key adapted to fit into a key-way 80.

formed in the strip of eraser material circumscribing the bodyportion, saidmaterial havmg an opening for the passage of the nozzle which latter serves not only as an outlet for the air in the chamber of the body portion, but also as an anchoring means for the eraser material and a pair of suctijoncups integrally side members of the body portion.

Referring more particularly to the accompanying drawings in which corresponding parts are ndicated by s milar reference characters Fig. 1 is a side elevation of the eraser forming the subject matter of this invention,

Fig. 2 is a longitudinal section through the centralportion of the eraser, and

Fig. 3 is a transverse vertical section taken on the line ii -30f Fig. 1. 3 t

' With the typewriter erasers at present available the construction does not permit replacement of the eraser material when worn. Moreover, the brush with which such erasers are usually equipped will not function to remove the erased particles as completely as would an air, blast furthermore they are frequently misplacedwith consequent loss of 7 time in locating them. For this reasonitris the aim and p p se i bis inY n iwi t r -"9.1 vide a simple, inexpensive all rubber eraser permitting ready removal and replacement of the eraser material, affording a blast producing means for quick-ly;. sepmating,theL

sheets of carbon and typewrlting paper and for removing the erasedsparticles and finalIy i g a l iphtl e raser maybe aflixed to theface of thetypewritersoas to be y rha lrfiei n. leiariewof its P- erator.

In the illustrated embodiment characteria ingthis inventiomthere is shown atypewr iter eraser of the character designated comprising a body portion t) including hemispherically p m n mir d-eithe periphery asjat; 3:) to form' an air chamber (4); The side sections (,lland are of rather 'fleiiible rnbber so as -to be readily compressed to expel the '3 air from chamber l) through an outlet hereinafterto be re; ferred to., t

Integral with the sections 1) and (2) are a pair "of suction cups (5 and (6) which:

enables either rigidly side ofthe body portion to be afiixedto any flat surface, as will be readily understood without; further discus.- "sion.

tions.( 1) T and are surrounded with an;an-'

nular strip orru to form'akey adapte'dtofitin, a key-way (8),

formed in the strip of eraser material (9) enm ef r h an fi rb e rr er tm s ee and "that y e. tjthee i mcups circling the body portion, as clearly shown in Figs' l and 3' of the drawings:

The eraser material (9.) is formed; with a tapered opening (l0) 'throu gh which there '"proj ectsa correspondingly tapered'outl'et nozzle- (ll) 1 which establishes 'communication be tweenthe i 'or of the chamber f) and'the exteriorofthe'eraser,

j Manifestlynozzle (11-) 1 not onlyf functions as an outletfor the air infchamber (4') of-the eraser-butalso serves asan anchoring means for theeraser'material (9) to prevent it creeping around the key.-"

Having set forth the structural details of this invention, itwilI'beeVident, compression 11 theb dii ettioeefths ere r rbe attached at either -side. to flat surface} tiestametheme fiihetrpen ten q t t The united peripheral-edges of theside sec;.

and; wmP isin a edy pe ion Y qrmed of e e ns, aterally p rkl d and. uni eiflat,

eir dg io rmanait. chamber, a rubber rib ss; lexi ili yw han he id seems, d. ncircl g; he. l tter at the r. noi i ..Q n on, ai b c n tituting they; rubb r. r RsQrIQu di g' d, form dith, a e way'to receive said key, said strip having a'n;

ing anda qzzle extendingiromtbe bi idy p rtiq iro ghp aidx pening o, stablish 99! mmunicat tw e the. nteriorh-fisaid; r. hamb r. nd heexteriqr-cot hae aser, An eraser: QmPQSeQiBQtiI-Q YJ of rubhet idi mp l s sab dyr portion, armed 9i; phape e s ct qnsiin mdattheirledges... a

ndfo m s m l. hamberw uh rky; encircling the body' pqrtien i t he. mint 7 ion o id de ection .Saiikey hayins sflexib i y than the; ideseQfiiQns, v a st ip;

f ras r mate ial. ur mmd nge he eyzan i. 99..

rmedi h a y ayrto prp de e. i911 i key, a rnq lejproieetingq em. hefbedya P rti n. 3 51 xtl cding into an opening, m d i h i ase r mate ial to, establish? iqnb w n-s idair hamheraad;

x er o ithe ase f a Anannula u era er. em esedfiiitirely of,

bbetandromprisin a bees Pei-ties. farmed 5' uphapedf i e estion r united: at. their,

Per phe yw pr v de an. ail-chamb r, a ubber 1.0.

y mii c i he body pQrtiQn-at he perirh:

ial dges dj i e' section, said ey have 111g: e sfle bi y haath del e ti lisig uq,

cm ups, n egrally, formed-1 wi h the side i section's, p 0f ermatsrial iemhraccing le th flkeyand erme vtwith ar eyrer oisee aidk y, a .nozz e n ie' t ngc r m lie,, dy oport onjahd" hr ig m'an Op ning the aseromater a r oL stablish.. omlnenieatien ween. hezii lchamberandltheex eriorQt; 9i

the r se and o orm an anchoring meenei r h ra e material rannil ric raserowmp sedrnt relyl i; u e -and mpri ing upsh pedgsislejs e;;, time united tthe rper ph ri sa r bherkey r 1% ei e in he b d'yrpor en. at 'jih iile iplierial edges of sai d side sections andfhaying, less fl xibi ity han he: idecseqtio isrs etionr 611 s i teg ally qrmsdavw h he esrect've i 9 stemmed t r piefge asje materie icir; 139;

cumscribing the key and formed with a keyway for its reception and a tapered nozzle extending from the body portion to a similarly shaped opening in the eraser material to establish communication between the air chamber and the exterior of the eraser and to provide an anchoring means for the eraser material.

5. In an eraser a body portion composed of flexible material and incorporating an air chamber therein, erasing material encircling the body portion, an opening into the air chamber and a second opening in the erasing material communicating with the first opening for the purpose described.

6. An eraser comprising a body portion composed of flexible cup shaped side sections united at their peripheries to form an air chamber, an opening into the air chamber at the junction of the peripheries, an annular strip of erasing material encircling the body portion and bestriding said junction, said strip being formed with an opening communicating with the first mentioned opening for the purpose disclosed.

7. An eraser comprising a flexible body portion composed of cup shaped side sections united at their edges in the form of a rib, an air chamber in the body portion, a passage through the rib into the air chamber, an annular strip of erasing material encircling the body portion and bestriding the rib, said strip being formed with a passage communi eating with the first mentioned passage.

WILLIAM HINES. 

